Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 559 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
2. 2.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
3. 3.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and left (c) points right (d) points up and right
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
5. 5.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
6. 6.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points left (c) points right (d) points straight up
9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
13. 13.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and left (c) points straight up (d) points left
14. 14.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 10
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
17. 17.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points left (c) points straight up (d) points up and right
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
31. 31.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo moves from 140° to 80°. How many degrees does it turn?
38. 38.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
39. 39.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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